Block.



UNITED STATES --ATENT @Eric/3E.

ALFRED isi TARBOX, or CHELSEA, MASSACHUSETTS.,

BLOCK".

SPECIFIOATO forming-part of Letters :Patent No. 712,862, dated -1\1'ovemloerl 4, 1902. Appnmioi fusa May 9,1902.v serial no. 106,622. (No maar.) t

To @ZZ whom, it may concern.- v Be it known that LALFR-Ei) B.- TARBOX, a citizen of the United States, residing at Chel sea, in the county of Suffolk and State lof Mas? sachusetts, have invented a new and useful' Improvement in Blocks, of which the following is a full, clear, and exact description, reference being had to the accompanying draw-v ings, forming a part of this specication, in explaining its nature. 1

The inventionespecially relates to blocks of small size; and 1it 'consistsjin various details of construction to which reference is hereinafter made. It is adapted rto be combined with any of the usual varietiesof blocks, such as hook, sister-hook, shackle, and reversibleshackle blocks.

I will now describe the invention in conjunction with the drawings, forming a part of this specification, Wherein- Figure l is a view in side elevation of a hook-block. Fig. 2 is a view largely in vertical central section thereof. Fig. 3 represents the invention as applied to a double block equipped with a reversible shackle.` Fig. 4 is a View representing the invention as applied to a single block with a reversible shackle. Fig. shows the invention com-y bined with sister hooks. Fig. 6 shows the block when combined with a ioorV or fasten#v ing plate or bracket. Fig. `7 represents a similar construction having increased flexi-l bility or range. Fig. 8 represents another modication in which a double block is usedwith a hook. Fig. 9 is a side elevation ofthe block, showing especially the skeleton sides.

The essential part of the invention is the way in which the sides of the block'are made to receive and hold Ythe hook, shackle, or.

other connection. y

Referring to the drawings, A A'represent the sides of the block. They preferably are of skeleton form, veach side having a continuous outer ring a, at one end of which is the extension ct,'which has a laterally-extending boss d2, and at the other end of which is an extension as, which has a laterally-extending boss a4, provided with an inward-curved seat a5 and also with a cylindrical recess 0.6 upon its inner face, which forms a bearing for the trunnion b of the hook or-other attachment B. The sides are made alike, and

.the lower bosses a2 and the upper bosses d4 abut.. The sidesare held together by rivets al as, the first of whichpasses through holes in the end bosses a2 and is'rivetedupon the outer surfaces of the gbossesjand the second of which passes through the extensions 0.3 and the trunnion b and is riveted upon the outer surfacesof the extensionsn The sides also "havethe integral cross-barsa?,which preferably are slightly rounded outwardly and vwhich intersect at d10, at about the center of the sides, and from the centers extend inward `Abosses la, in each of which isa holeA 0,12, opening from its inner face, andA these holessupport the ends of the sheave-pi-n c, which passes through the hub c'v of the sheave C. The sides of the sheave-hubc' bear against the inner faces of the bosses all.

The hook B or other attachment carried by the block-such as a shackle (see Fig. 8) or a reversing-shackle connection (see Figs. 3 and 4) or sister hooks (see Fig. 5) or a connection with a door plate or bracket, either fdirectly, asrepresented in Fig. 6,or indirectly, as shown in Fig. 7-is connected with the block by a trunnion b, which extends from each side of the inner end of the hook and enters the recesses or bearings in the extensions, @dof the sides and is seated, in Athe grooved cavities a5of the bosses o4. Not only is the hook thus connectedA or jointed with the sides, but' it is alsosecured thereto by the pin a5, which extendsthrough ,the eX- tensions and the trunnion Vand acts' to support the trunnion as wellas to fasten' the sides together.`

In Fig. 3 a double block is shown; but the construction differs from that of Figs. 1 and `2 only in having an eXtra sheave anda center piece between the two sides, separating the trunnions of the connection which carries the shackle and by means of which the shackle is made reversible with respect to the block.

Fig. 4: follows the constructionV ofFig. 2, 'with the exception that a shackle is used instead of a hook and 'a connection which permits of the reversal of the shackle.

In Fig. 5 the block has the construction of Fig. 2, but instead of one hook what is known as sister hooks are used, D representing one hook and D the other. Each of these IOO hooks has a trunnion, the two trunnions together being like the single trunnion of Fig. 1 and being held to the sides of the block in the manner described. The outer end of each hook has a curved and iiat face, with the flat faces upon the inside. The two hooks may each be turned upon the pin in opposite directions to be separated from each other and to afford means for attaching the block to a ring or link, and when both hooks have made engagement therewith they are held in closed position by the shackle or link. Such engagement can only be had by a peculiar twisting or turning movement of the eye or link with regard to the hooks, and When once engaged disengagement cannot accidentally occur. It will be understood, of course, that the trunnion and the pin afford means by which the hooks or connections may be turned laterally with respect to the block.

In Fig. 6 a trunnion connection directly with a floor-plate E is represented, and in Fig. 7 a trunnion connection with a ball-andsocket joint, comprising the parts e, c, and e2, is represented, the ball being at the end of the trunnion connection and the socket being held in place by the plate.

In Fig. 8 a shackle is shown having a trunnion connection with a double block and carrying a hook or other connections.

The advantages of the invention lie in the simplicity and cheapness of the construction, the employment of the smallest possible metal for securing the greatest strength combined with lightness, and the manner in which the sides of the block are connected with the hook, shackle, floor-plate, or other analogous device forming a part of it.

Having thus fully described my invention, I claim and desire to secure by Letters Patent of the United States- 1. A block having skeleton sides formed by an outer ring, integral cross-bars intersecting at the center and providing bearings for the sheave, the said skeleton sides also having extensions at each end provided with lateral bosses, the faces of which abut and being fastened together by pins which extend through the said extensions.

2. A block having sides provided with end extensions and lateral bosses and also provided with central bosses having holes extending inward from their faces, but not through the bosses, for receiving and holding and preventing endwise movement of the sheave, its pin, and pins extending through the ends for fastening the sides together and the sheave and its pin in position.

3. The block herein described having at one end extensions each provided with a lateral boss having a grooved seat and a cylindrical bearing extending from its inner face with the hook or other block appurtenances having a trunnion held in said seat and the outer ends of which are contained in said bearings.

4. A block having sides provided at one end with circular bearings extending from their inner face and also with bosses Within the line of the bearings and with pin-holes in line with the bearings, and a block-hook or other appnrtenance having a trunnion provided with a longitudinal hole extending through it and the ends of which are contained within said bearings, and a pin extending through the ends and the trunnion.

5. A block having sides provided at one end with circular bearings extending from the inner faces and also with bosses within the line of the bearings and with pin-holes in line with the bearings, and a block or other appnrtenance having a trunnion provided with a longitudinal hole extending through it and the ends of which are contained Within said bearings, and a pin extending through the ends and the trunnion, the said pin serving as an additional means for attaching the trunnion to the sides and also as a means for fastening the sides at that end of the block together.

6. Ablock having sides, extensions of which at one end face each other and having bearings extending outward from their opposing faces and sister hooks connected with said sides by a trunnion connection contained in said bearings.

ALFRED B. TARBOX.

Witnesses:

F. F. RAYMOND, 2d, J. M. DoLAN. 

